<template>
  <div class="content">
    <div class="button">
      <el-button @click="getCompetence()" type="primary">打开摄像头</el-button>
      <el-button @click="stopNavigator()" type="danger">关闭摄像头</el-button>
      <el-button @click="setImage()" type="success">拍照</el-button>
      <el-button @click="upload()">上传</el-button>
    </div>
    <div class="show">
      <h1>车牌号:{{this.picture}}</h1>
      <h2>车牌颜色:{{this.pic_name}}</h2>
    </div>
    <div class="camera_outer">
      <video id="videoCamera" :width="videoWidth" :height="videoHeight" autoplay></video>
      <canvas style="display:none;" id="canvasCamera" :width="videoWidth" :height="videoHeight"></canvas>
      <div v-if="imgSrc" class="img_bg_camera">
        <img :src="imgSrc" alt class="tx_img" />
      </div>
      <!-- <div class="button">
      <el-button @click="getCompetence()">打开摄像头</el-button>
      <el-button @click="stopNavigator()">关闭摄像头</el-button>
      <el-button @click="setImage()">拍照</el-button>
      </div>-->
    </div>
  </div>
</template>
<script>
import http from "../api";

export default {
  data() {
    return {
      picture: "",
      pic_name: "",
      videoWidth: 700,
      videoHeight: 600,
      imgSrc: "",
      thisCancas: null,
      thisContext: null,
      thisVideo: null,
      openVideo: false,
      fileList: [
        {
          name: "food.jpeg",
          url:
            "https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100",
        },
        {
          name: "food2.jpeg",
          url:
            "https://fuss10.elemecdn.com/3/63/4e7f3a15429bfda99bce42a18cdd1jpeg.jpeg?imageMogr2/thumbnail/360x360/format/webp/quality/100",
        },
      ],
      collapsed: false,
      isUpload: false,
      imgUrl: "",
    };
  },
  mounted() {},
  methods: {
    upload() {
      http.getcarShiBie({}).then((r) => {
        console.log("22222", r.words_result);
        this.picture=r.words_result.number
        this.pic_name=r.words_result.color
      });
    },
    getCompetence() {
      var _this = this;
      _this.thisCancas = document.getElementById("canvasCamera");
      _this.thisContext = this.thisCancas.getContext("2d");
      _this.thisVideo = document.getElementById("videoCamera");
      _this.thisVideo.style.display = "block";
      // 获取媒体属性，旧版本浏览器可能不支持mediaDevices，我们首先设置一个空对象
      if (navigator.mediaDevices === undefined) {
        navigator.mediaDevices = {};
      }
      // 一些浏览器实现了部分mediaDevices，我们不能只分配一个对象
      // 使用getUserMedia，因为它会覆盖现有的属性。
      // 这里，如果缺少getUserMedia属性，就添加它。
      if (navigator.mediaDevices.getUserMedia === undefined) {
        navigator.mediaDevices.getUserMedia = function (constraints) {
          // 首先获取现存的getUserMedia(如果存在)
          var getUserMedia =
            navigator.webkitGetUserMedia ||
            navigator.mozGetUserMedia ||
            navigator.getUserMedia;
          // 有些浏览器不支持，会返回错误信息
          // 保持接口一致
          if (!getUserMedia) {
            //不存在则报错
            return Promise.reject(
              new Error("getUserMedia is not implemented in this browser")
            );
          }
          // 否则，使用Promise将调用包装到旧的navigator.getUserMedia
          return new Promise(function (resolve, reject) {
            getUserMedia.call(navigator, constraints, resolve, reject);
          });
        };
      }
      var constraints = {
        audio: false,
        video: {
          width: this.videoWidth,
          height: this.videoHeight,
          transform: "scaleX(-1)",
        },
      };
      navigator.mediaDevices
        .getUserMedia(constraints)
        .then(function (stream) {
          // 旧的浏览器可能没有srcObject
          if ("srcObject" in _this.thisVideo) {
            _this.thisVideo.srcObject = stream;
          } else {
            // 避免在新的浏览器中使用它，因为它正在被弃用。
            _this.thisVideo.src = window.URL.createObjectURL(stream);
          }
          _this.thisVideo.onloadedmetadata = function (e) {
            _this.thisVideo.play();
          };
        })
        .catch((err) => {
          console.log(err);
        });
    },
    //  绘制图片（拍照功能）
    setImage() {
      var _this = this;
      // canvas画图
      _this.thisContext.drawImage(
        _this.thisVideo,
        0,
        0,
        _this.videoWidth,
        _this.videoHeight
      );
      // 获取图片base64链接
      var image = this.thisCancas.toDataURL("image/png");
      _this.imgSrc = image; //赋值并预览图片
    },
    // 关闭摄像头
    stopNavigator() {
      this.thisVideo.srcObject.getTracks()[0].stop();
    },
    // base64转文件，此处没用到
    dataURLtoFile(dataurl, filename) {
      var arr = dataurl.split(",");
      var mime = arr[0].match(/:(.*?);/)[1];
      var bstr = atob(arr[1]);
      var n = bstr.length;
      var u8arr = new Uint8Array(n);
      while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
      }
      return new File([u8arr], filename, { type: mime });
    },

    // tirggerFile(event) {
    //   var file = event.target.files;
    //   var reader = new FileReader(); //读取文件
    //   reader.readAsDataURL(file[0]);
    //   reader.onload = function () {
    //     document.getElementById("img1").src = reader.result;
    //   };
    //   console.log(event);
    // },
    uploadImg(e) {
      console.log(e);
      this.isUpload = true;
      let file = e.target.files[0];
      let url = "";
      var reader = new FileReader();
      reader.readAsDataURL(file);
      let that = this;
      reader.onload = function (e) {
        url = this.result.substring(this.result.indexOf(",") + 1);
        that.imgUrl = "data:image/png;base64," + url;
        console.log("这是", that.imgUrl);
      };
    },
    toggleCollapsed() {
      this.collapsed = !this.collapsed;
    },
    // toIndex() {
    //   this.$router.push({
    //     name: "首页",
    //   });
    // },
  },
};
</script>
<style>
.img {
  opacity: 0;
}
.imgs {
  border: 1px solid #78c3f3;
  background: #aadffd;
  color: #1e88c7;
  border-radius: 4px;
  text-align: center;
  cursor: pointer;
  padding: 10px;
}

.content {
  width: 100%;
  height: 720px;
  /* display: flex; */
  /* background-color: lightblue;
  position: relative; */
}
.camera_outer {
  display: flex;
}
.d-header {
  width: 100%;
  height: 50px;
  background-color: lightcoral;
  position: absolute;
}
</style>